My theory about Callie
Think about the way Shauna treated Jackie. It was this toxic mix of love, jealousy, and eventually, a cold necessity to survive. I think Callie is basically the ghost of Jackie and the ruthlessness of Shauna mashed into one person. By Season 4, Shauna is going to be a total liability. She’s messy, she’s impulsive, and she’s got a trail of bodies (Adam, etc.) that the cops are always five minutes away from finding.
The breaking point? It’s going to be Callie realizing that her mother is the "dead weight."
In the woods, the girls learned that you have to cut off the infected limb to save the body. Callie has grown up watching Shauna lie, manipulate, and butcher things in their kitchen. She’s been "trained" without even knowing it. I could see a scenario where Shauna tries to take the fall for Callie for something, but Callie realizes that as long as Shauna is alive, the "Wilderness" (the trauma, the secrets, the chaos) will never leave them alone.
It won’t be a big, emotional accident. It’ll be Callie making a choice. She’ll use the same knife Shauna uses for their human meat. Shauna spent her life haunted by what she did to her best friend in the woods, only to be taken out by the person she brought into the world to replace her.
I want to see Callie become the wilderness Queen, with other theories mixed into it, or she may help/kill everyone else to protect her mother, then kill her mother... I'm not sure, I just want to see Callie become what they have been pointing out over and over. She already believes she's worse than her mom Shauna